Welcome!Retrofitting Existing Homes!!

Passive Design Principles - Windows!!VIDEO!!!!

Why Bother?!• Population growth in Australia has doubled in last 50 years !• Everything we do puts pressure on the environment and

therefore the energy grids.!!• Canada 2003 blackout - 10 million people in

Ontario and 45 million in 8 US states.!• Due to hot days, increased usage and load on

power station, back up and computer fails, resulting in:!• 256 power plants offline!• Water supply cut off due to pumps not working potentially

contaminating water.!• Transportation, communication and industry down.!

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!What can we do?!!Having an efficient home means:! - Lower running costs ! - Less or zero pressure on the grid! - Improved quality of life / comfortable living!!!

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Question !!!!

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Passive Building Design !!!

windows, walls, and floors are made to collect, store, and distribute energy from the sun in the form of heat in the winter and reject solar

heat in the summer, without using any mechanical devices.!!!!

new -vs- existing!!!!

7 Passive Design Principles - Windows!!!!!!!!!!!

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In the southern hemisphere, !Summer - sun rises in South East and sets in South West!Winter - sun rises North East and sets in North West!(Azimuth Calculators for exact altitude, time, date etc)!!The orientation of a building plays an important part in ensuring the passive design principles work

Orientation

7 Passive Design Principles - Windows!!

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!K e y D e s i g n R e s p o n s e s SUBTROPICAL:!!• Lightweight Construction!• Cross Ventilation Techniques!• Exposure for Breezes!• Evaporate Cooling or Ceiling Fans!• Shade whole building where

possible in summer!• Allow passive solar access in

winter months only!• Shade all east and west walls or

glass!• Insulation considerations!• Light colours!• Screened & Shaded outdoors

Climate Zone

!7 Passive Design Principles - Windows!

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Thermal mass in the interior absorbs the sunlight and radiates the heat at night.

Thermal Mass

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Insulation & Air Leakage!Buffers & Cracks or Gaps!! ! ! ! ! ! !Glazing/Shading!Heat Flow or!Heat Transfer!! ! ! ! ! ! ! !Ventilation!Air Movement!!Zoning!Placement of Furnitures, Fixtures & Fittings

7 Passive Design Principles - Windows!

Orientation!!- Consider which aspect the window is facing and the impact of

this!!!!!!!!

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Its Summer in Brisbane.!!What could we do to this room to reduce:!!- the solar heat in the morning?!!- the solar heat in the afternoon?

Orientation - !Solution!!!!!!!

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!1.Tree/Shrubs or Shading!2.Dual Blinds!3.Window Toppers!

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Climate Zone / Ventilation!!!!!!!!!!!!

Building height and depth play a huge role in the structure's ability to effectively pull outside air through occupied spaces. !

In a nutshell, upper floors & roofs have exposure for more breeze than lower levels. !!

!K e y D e s i g n R e s p o n s e s

SUBTROPICAL:!!• Lightweight Construction!

• Cross Ventilation Techniques!

• E x p o s u r e f o r Breezes!

• Evaporate Cooling or Ceiling Fans!• Shade whole building where

possible in summer!• Allow passive solar access in

winter months only!• Shade all east and west walls or

glass!• Insulation considerations!• Light colours!• Screened & Shaded outdoors

Climate Zone / Ventilation - !Solution!

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OPEN THE WINDOWS! !!!or retrofit for improved cross ventilation:!!• adding flyscreens to doors and windows!• building quote to create new window (or

equivalent ventilation system)!!

!Insulation/Zoning & Air Leakage!

!Window are the biggest cause of heat transfer, both in & out.!

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Insulation/Zoning & Air Leakage -!Solution!!!!!!

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Create a Thermal Mass to prevent leakage!!

• Curtains/Blinds!• Acrylic Gap Filler!• Glazing

Double Glazing or Glass Thickness!

Room Zoning!Furniture can be strategically placed for comfort

******************!All on instances!!******************!!Check if solution

negates priority for Climate Zone

Glazing/Shading!!

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1. Energy passes through the glass.2. Energy is reflected away from the glass.3. Energy is absorbed within the glass.

!Therefore, total solar energy is either reflected, transmitted or absorbed. These actions are always expressed in percentages that will always total 100%.

Glazing/Shading - !Solution!

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******************!All on instances!!******************!!Check if solution

negates priority for Climate Zone

Solar Film - Number represents the % of light that gets in through film!!Overhangs or Window Awnings - ones that can be folded away will give you flexibility of stopping solar gain in summer or attracting it in

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Our population is growing fast and with it increased load on energy grid & the environment.!

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Passive Design renders a home efficient, creating natural sources of heating or cooling, increasing our quality of life and comfort.!

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Passive Design Principles should be the key component to ALL newly built homes!They should consider:!

!! Orientation! ! ! Thermal Mass/Comfort! ! Zoning ! ! Glazing/Shading!!!! Climate Zone! ! Air Leakage!! ! ! ! Ventilation! Insulation! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !! ! !! ! ! ! ! !! ! !

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